Flange pressure rating
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The units for flange pressure ratings are bar, MPa, and Class. What is the unit for Class?
Generally, it refers to the pressure rating of American standard flanges, such as 150LB, 300LB, 600LB, and so on.
PN (MPa) 2.0 5.0 10.0 15.0 26.0 42.0 Equivalent to CL (lb/in2) 150 300 600 900 1500 2500 American standard grades
American standards: nowadays, many valves can be manufactured to meet American standards
\"Class\" is not a unit of pressure; it refers to a grade. For example, 300 class indicates a pressure grade of 300 pounds
The class denotes the ANSI/ASME pressure rating, and the number following it, ***, indicates that the maximum operating pressure allowed at a certain operating temperature is *** psi.
Levels below 2500 are according to the ANSI standard, while 5000 corresponds to the API standard; please pay close attention to this
600LB corresponds to 11.0MPa according to the ANSI flange standards set by the Ministry of Chemicals
It’s difficult to determine which one is correct; hence, a pressure conversion table is attached. Symbol, Multiply, By, To Obtain: Symbol, PSI (pounds per square inch): 0.069 Bar; No symbol, Pounds Per Sq. In.: 6.89 Kpa; Pounds Per Sq. In., Kilopascals; PSI, Pounds per square inch: 0.07 Kg/Cm²; Pounds Per Sq. In., Kilogram Per Sq. Centimeter; Lb./Ft², Pounds per square foot: 4.88 Kg/M²; Pounds Per Sq. Ft., Kilogram Per Sq. Meter; Kpa, Kilopascals: 0.145 Pounds per square inch; PSI, Kilopascals; Pounds Per Sq. In., Kg/Cm², Kilograms per square centimeter: 14.22 Pounds per square inch; PSI, Kilogram Per Sq. Centimeter, Pounds Per Sq. In.
What is mentioned on the 7th floor seems more suitable for you. The pressure ratings we talk about are related to temperature conditions; the temperature range corresponding to pressure ratings in the American standard is higher than that in the European standard. Therefore, it’s not possible to simply convert pressure units – considerations based on temperature are necessary.
I can never remember the conversion rules for pressure levels; fine, I’ll memorize them now. Thank you
The baseline conditions for the two are different, so there is no absolute relationship
MPa multiplied by 10 is equivalent to bar PN(MPa): 2.0, 5.0, 11.0, 15.0, 26.0, 42.0. CLASS(LB): 150, 300, 600, 900, 1500, 2500
CLASS600 corresponds to PN 110bar
About to go to the site for verification; learned something useful, great stuff.